Added gfortran detection script

script/detect_gfortran

+#! /bin/bash
+
+function detect_gfortran()
+{
+    command -v $1 >/dev/null 2>&1
+    if [ $? -ne 0 ]; then
+      dgc_ret=0
+      return
+    fi
+
+    dgc_ret=1
+}
+
+

script/solve_gfortran

+#! /bin/bash 
+
+function solve_gfortran() {        
+source script/show_solutions
+source script/discover_package_manager
+discover_package_manager $1
+pcman=$discover_package_manager_ret
+
+if [ x"$pcman" = x"" ]; then
+        exit 1
+fi
+
+if [ x"$1" = x"osx" ]; then 
+        commands[0]="$pcman install gfortran"
+        possible_solutions "${commands[@]}"
+        echo "Executing: ${command[$possible_solutions_ret]}"
+        eval ${commands[$possible_solutions_ret]}
+elif [ x"$1" = x"linux"  ]; then
+        commands[0]="su -c \"$pcman install cmake\""
+        commands[1]="sudo $pcman install cmake"
+        possible_solutions "${commands[@]}"
+        echo "Executing: ${command[$possible_solutions_ret]}"
+        eval ${commands[$possible_solutions_ret]}
+fi 
+}
+